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Philips Semiconductors
PCA9552
16-bit I 2 C-bus LED driver with programmable blink rates
6. Functional description
Refer to Figure 1 “Block diagram of PCA9552” .
6.1 Device address
Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9552 is shown in Figure 5 . To conserve power, no
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
slave address
1
1
0
0
A2
A1
A0 R/W
fixed
programmable
002aac169
Fig 5. PCA9552 address
The last bit of the address byte de?nes the operation to be performed. When set to logic 1
a read is selected, while a logic 0 selects a write operation.
6.2 Control Register
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9552, which will be stored in the Control Register. This register can be
read and written via the I 2 C-bus.
0
0
0
AI
B3
B2
B1
B0
Auto-Increment flag
register address
002aac170
Reset state: 00h
Fig 6. Control Register
The lowest 3 bits are used as a pointer to determine which register will be accessed.
If the Auto-Increment ?ag (AI) is set, the four low order bits of the Control Register are
automatically incremented after a read or write. This allows the user to program the
registers sequentially. The contents of these bits will rollover to ‘0000’ after the last
register is accessed.
When the Auto-Increment ?ag is set (AI = 1) and a read sequence is initiated, the
sequence must start by reading a register different from ‘0' (B3 B2 B1 B0 ≠ 0000).
Only the 4 least signi?cant bits are affected by the AI ?ag. Unused bits must be
programmed with zeroes.
PCA9552_5
? Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 05 — 9 March 2006
5 of 28
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